Eaton rear axle inspection plate - The 1947 - Present Chevrolet & GMC Truck Message Board Network

prg machine · 04-18-2009, 07:41 PM

DRAT!!!
On my K-20, rear axle, I took the cover off because it was leaking and permatexed the heck out of it and am wondering now if it is upside down!!

Does the fill plug go to the left or right side of the vehicle looking at the cover. Going right puts it high going left puts it low. It appears that the bolt pattern is universal allowing this mistake.
DRAT!!

prg machine · 04-18-2009, 07:45 PM

If there is a 50 / 50/ chance guess how it usualy goes!!!!!

I am not in the mood to go through this mess again!!!

Longhorn Man · 04-18-2009, 08:05 PM

my eaton truck isn't here right now... but I think I have a photo of one installed...

And lower left it is!
Special thanks to MTDave for a very old photo of his 72 longhorn.

**Tetdoeuf** · 04-18-2009, 08:05 PM

This is what mine looked like...

prg machine · 04-18-2009, 10:05 PM

Like I said: 50/50 chance and what do ya know? I didn't notice it till I was filling up and thought WOW that fill hole is awful high!
Anyway I pulled it off and started over ..............now it's right. Pays to take a second look always. I was so concerned about getting permatex everywhere and in every hole and on every bolt to stop the drip from the cover that I tripped right into the trap!!!!!

vectorit · 04-18-2009, 10:15 PM

Since were all showin our rear ends, here is mine... Bein that I missed the Amtrak goin by Mugs away saloon n all

4x4Poet · 04-19-2009, 02:21 AM

If you perfectly place the cover on with the drain hole high, it will hit the ring gear.

Longhorn Man · 04-19-2009, 11:42 AM

filler hole... not the drain.

Shaky · 04-19-2009, 11:50 AM

Darn - I've got the only rusty rear.

Longhorn Man · 04-19-2009, 12:16 PM

that means you have one in a billion... yours doesn't leak.(as much)
The eaton diff is kinda known for being a leaker.

factorystock · 04-19-2009, 12:51 PM

The gasket kit is still available at some auto parts stores. There are 2 different thickness gaskets, they say the thin one is for the front pumkin and the thick one is for the cover?

prg machine · 04-19-2009, 01:24 PM

Quote:

Originally Posted by 4x4Poet

If you perfectly place the cover on with the drain hole high, it will hit the ring gear.

It didn't seem to in my case or perhaps that would have tipped me off. I have the 4:10 if that is a different diameter perhaps???? Regardless, I didn't run it till I turned it back over to the correct position. Only took another hour to remove and start over. Some of my leak comes from the pinion seal I do believe. The worst thing bout em is that the bolt holes go straight through and if threads aren't gooped up good the oil seeps through the bolt holes!!

04-18-2009, 07:41 PM	#1
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Eaton rear axle inspection plate DRAT!!! On my K-20, rear axle, I took the cover off because it was leaking and permatexed the heck out of it and am wondering now if it is upside down!! Does the fill plug go to the left or right side of the vehicle looking at the cover. Going right puts it high going left puts it low. It appears that the bolt pattern is universal allowing this mistake. DRAT!! __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

04-18-2009, 07:45 PM	#2
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton rear axle inspection plate If there is a 50 / 50/ chance guess how it usualy goes!!!!! I am not in the mood to go through this mess again!!! __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

04-18-2009, 08:05 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Eaton rear axle inspection plate my eaton truck isn't here right now... but I think I have a photo of one installed... And lower left it is! Special thanks to MTDave for a very old photo of his 72 longhorn. Attached Images

04-18-2009, 08:05 PM	#4
Tetdoeuf Invest in Gold! Join Date: Sep 2007 Location: OC, CA Posts: 69	Re: Eaton rear axle inspection plate This is what mine looked like... __________________ John Gold 1970 Chevy LWB Fleet Last edited by Tetdoeuf; 04-18-2009 at 08:08 PM.

04-18-2009, 10:05 PM	#5
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton rear axle inspection plate Like I said: 50/50 chance and what do ya know? I didn't notice it till I was filling up and thought WOW that fill hole is awful high! Anyway I pulled it off and started over ..............now it's right. Pays to take a second look always. I was so concerned about getting permatex everywhere and in every hole and on every bolt to stop the drip from the cover that I tripped right into the trap!!!!! __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

04-18-2009, 10:15 PM	#6
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Eaton rear axle inspection plate Since were all showin our rear ends, here is mine... Bein that I missed the Amtrak goin by Mugs away saloon n all Attached Images __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU Last edited by vectorit; 04-18-2009 at 10:18 PM.

04-19-2009, 02:21 AM	#7
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Re: Eaton rear axle inspection plate If you perfectly place the cover on with the drain hole high, it will hit the ring gear. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

04-19-2009, 11:42 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Eaton rear axle inspection plate filler hole... not the drain.

04-19-2009, 11:50 AM	#9
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Eaton rear axle inspection plate Darn - I've got the only rusty rear. Attached Images

04-19-2009, 12:16 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Eaton rear axle inspection plate that means you have one in a billion... yours doesn't leak.(as much) The eaton diff is kinda known for being a leaker.

04-19-2009, 12:51 PM	#11
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,369	Re: Eaton rear axle inspection plate The gasket kit is still available at some auto parts stores. There are 2 different thickness gaskets, they say the thin one is for the front pumkin and the thick one is for the cover?



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